Milling-machine.



A. T. HEDPELDT.

MILLING MACHINE.

APPLICATION FILED 001*. 19, 1912.

Patented Apr. 21, 1914.

w. w o, M i ww 0 L d AXEL T. HEDFELDT, OF CHICAGO, ILLINOIS.

MILLING-MACHINE.

Specification of Letters Patent.

' Patented Apr. 21, 1914.

Application filed October 19, 1912. Serial No. 726,626.

To aZZ whom it may concern Be it known that I, AXEL T. I-IEDFELDT, a citizen of the United States residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Milling-Machines, of which the following is a specification.

lvly invention relates to improvements in milling machines particularly those machines adapted to feed and scour the grain.

It is illustrated diagrammatically in one form of the accompanying drawings where- 1n- Figure 1 is a front elevation with parts in section; Fig. 2 is a section along line 2-2 of Fig. 1; Fig. 3 is a detail assembly view of the milling roll on a large scale in side elevation; and Fig. 4; is an end elevation of one of the segments of the milling or scouring roll.

Like parts are indicated by like letters throughout the several figures.

A is a casing mounted on the frame A and containing the two inclined floor members A A slightly separated at their bottom and closed by the valve A to form a storage reservoir.

A is a glass or other transparent window in the wall of the storage reservoir whereby v the operator may inspect the interior and tell how much material is therein.

B B are inclined floor members slightly removed one from the other and located beneath the storage reservoir.

B is a preliminary milling or scouring roll having the scouring pins B projecting therefrom. B is a shaft for said scouring roll, B a drive pulley and B a driving belt therefor operated from any suitable source of power.

C C are inclined floor members forming the final scouring and milling chamber separated at their lower end and discharging into the screen C C is a shutter mounted on the member C adapted to be locked into position by the bolts C to limit the distance between the screen and the upper portion of the opening.

C is a shutter slidable on the board C controlled by the lever C to control the depth of the sheet of material on the screen.

D is a scouring and milling roll mounted on the shaft D at the bottom of the scouring chamber above the opening and adapted to be rotated by the belt D and driving pulley D on the shaft D the belt being driven from any suitable source of power.

The scouring roll is made up of a plurality of segments E from which project the staggered scouring pins E E The segments E are each provided with a set screw in opposition to the shaft D Between the segments E are located the segments E These segments are all of them provided on one end with a slot E and on the other with a lug E to engage the slot E so that when the segments or sections are threaded upon the shaft D and the lugs to engage the slots and the two end segments are fastened to the shaft by the set screws then the whole forms an integral scouring roll. By this arrangement the scouring roll may be easily adjusted into position and renewals may be easily made, since, in case it is desired to change one of the segments or even all of them, all that is necessary is to remove the shaft, withdraw the sections which are to be removed and re place them by others.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made in size, shape and arrangement of parts without departing materially from the spirit of my device.

The use and operation of my invention are as follows: The upper storage hopper or reservoir is filled with the grain and granular substance to be secured and cleaned and the machine is then started, the two scouring and milling rolls being simultaneously rotated. The valve A is then rotated to permit the grain to run into the upper of the two scouring reservoirs. The grain will then substantially fill the reservoir and by the rotary movement of the pins will be secured and cleaned. It will then pass down into the lower reservoir and here again the grain will be secured and cleaned by the rapidly moving scouring roll. Moreover, the movement of these rolls will control the feed of the grain through the opening and thus the feed to the screen will be regulated by the rotation of the roll. I find by experiment that with the parts in substantially the relative position indicated the grain will not feed unless the securing roll is in rotation and that the amount of feed depends .very largely upon the speed of the rotation of the scouring roll. Thus a single securing and milling roll operates both as a scouring and cleaning member and also as a feed member to control the amount of feed. It will be evident, therefore, that the upper chamber beneath the hopper might be dispensed With, although for the purpose of rendering the Work more satisfactory I prefer to use the two. The grain, of course, runs down upon the screen, Which may or may not be oscillated by any suitable mechanism as the case may be, and is separated as it passes doWn the screen, the coarser being discharged from'the end of the screen and the finer passing through it.

I claim:

1. A grain feeding device comprising a milling and feeding V-bottomed hopper, a discharging slot through the bottom at the apex of the V, and a feeding and scouring pin-roll located in the apex above the slot but adjacent to it, said roll being larger than the slot, an inclined discharge screen located immediately beneath said discharge opening and means mounted on the V-shaped bottom for varying the effective space between the bottom of the V and the screen to control the flow of material from the hopper along the screen.

2. A grain feeding device comprising a milling and feeding V-bottomed hopper, a discharging slot through the bottom at the apex of the V, and a feeding and scouring pin-roll located in the apex above the slot but adjacent to it, said roll being larger than the slot, an inclined discharge screen located immediately beneath said discharge opening and means mounted on the V-shaped bottom for varying the effective space between the bottom of the V and the screen to control the flow of material from the hopper along the screen, a supply hopper located above said feeding hopper, means for controlling the discharge of material therefrom, a preliminary feeding and milling hopper located bctween said supply hopper and said V-bottomed hopper and a discharge from said preliminary feeding and milling hopper to the discharge and milling hopper.

Signed at Chicago, Illinois, this 12th day of October, 1912.

AXEL T. HEDFELDT.

Witnesses:

MINNIE M. LINDENAU, LULU J ORDAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

